While I can recommend the 760 and especially the 7870, the Asus 770 is a disappointment.
The EVGA SC series is to be avoided if your goal is to overclock. Unlike Asus, MSI and Gigabyte the SC series is the only factory OC'd card of the bunch that does not use a custom PCB and beefed up VRM to handle the additional load.
That leaves the MSI N Series and the Gigabyte Windforce both of which are clocked at 1137 Mhz. The EVGA is at 111 Mhz and the Asus pulls up the rear at 1058 Mhz ... the Asus is capable of overclocking as high as the two 1137 ones but Asus' unwillingness to guarantee the 1137 puts it on my "no recommend" list.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127741
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125463
Personally, I use the MSI's for 770 builds and the Asus for 7870 builds. I'll use Giga if color scheme, limited availability or price advantage. The EVGA SC I wont touch but the EVGA Classified series are excellent